Combined ore-roasting and fume-saving apparatus.



No. 708,977. Patented Sept. 9, I902.

W. H. MOTTEB. COMBINED ORE ROASTING AND FUME SAVING APPARATUS.

(Application filed av 25, 1901) (No Model.) 7 2 Sheets-Sheet I.

M. R m 0 mm m Q II M h d n 'fl w @k w w w w m k A \II M N\ A/ m 'l/ I Am% Q Q MN 0 mm. x m

No. 708,977. Patented Sept. 9, I902.

W. H. MOTTER.

COMBINED ORE ROASTING AND FUME SAVING APPARATUS.

(Application filed Nov. 26, 1901.\

(No' Model.)

2 Sheets-Sheet 2 O/ axw ATTORNEY.

Tm: "ohms ws'reus n1, mo'raurholwuumcmn u. o.

UNITED STATES PATENT O ErcE.

WILLIAM H. MOTTER, OF DENVER, COLORADO.

COMBINED ORE-ROASTING AND FUME-SAVING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 708,977, datedSeptember 9, 1902.

Application filed November 25,1901. Serial No. 83,654- (No model.)

State of Colorado, have invented certain new. and useful Improvements ina Combined Ore- Roasting and Fume-Saving Apparatus; and

I do declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to makeand use the same, reference being had to theaccompanying drawin gs,and to the characters of reference marked'thereon, which form a part of this specification.

My invention relates to improvements in roasting-furnaces; and itconsists of the features, arrangements, and combinations hereinafterdescribed and claimed, all of which will be fully understood byreference to the accompanying drawings, in which is illustrated anembodiment thereof.

In the drawings, Figure 1 is avertical 10ngitudinal section takenthrough .myimproved ore-roasting apparatus, the front part being brokenaway for lack of room on the sheet. Fig. 2 is a cross-section taken onthe line 9300, Fig.1. Fig. 3 is a similar section taken on the line y y,Fig. 1, the parts being enlarged. Fig. 4 isa section taken on the line.2 .2, Fig. 3, a carrying-wheel being shown in elevation. Fig. 5 is afragmentary section taken through the front part of the furnace, thefume-saving attachment being shown in elevation. In this view the partsare shown on a larger scale than in Fig. 1. Fig. 6 is a section taken onthe line to w, Fig. 5, parts being shown in elevation. Fig. 7is anenlargement of part of Fig. 5. Fig. 8 is a fragmentary section takenthrough the rotary conveyer of the apparatus, the perforated inner pipebeing shown in elevation. Fig. 9 is a cross-section taken on the line 8s, Fig. 8.

The same reference characters indicate the same-parts in all the views.

Let the numeral 5 designate a masonry housing or casing inclosing alongitudinal chamber or fine 6,at one extremity of which is located thefire-box? and at the opposite extremity the stack 8.

Within the longitudinal chamber 6 and extending the entire lengththereof is a rotary conveyer 10, through which the ore travels duringthe roasting operation and wherein it is protected from direct contactwith the products of combustion from the fire-box. This conveyer ismounted and turns on carrying-wheels 12, arranged in pairs located atsuitable intervals. On the inner surface of the conveyer 10 are formedbroken spirals or conveyin'gthreads 10*. As shown in the drawings, thereare two of these spirals running parallel to each other. threads orspirals allow the ore to pass between their parts or sections, andthereby retard the speed of its-travel through the conveyer andfacilitate its exposure to the roasting action of the heat.

The ore to be treated is fed from a hopper 13 to a feed-screw 15,whichdelivers it to the forward or right-hand extremity of the conveyerl0, referring to Figs. 1 and 5. This conveyer is mounted onball-bearings at its forward and rearward extremities, as shown atA andB. Its forward extremity is surrounded by a gear 15, which meshes withsmaller gears 16, one of which is fast on a shaft 17, provided with apulley 18, which may be connected by means of a belt (not shown) with aline-shaft or other suitable propelling apparatus for operating theconveyer and its connections. On the shaft 17 is made fast a gear 19,which meshes with the gear 20 on the feed-screw for operating thelatter.

Within the conveyer l0 and extending longitudinally therethrough is aconcentricallyarranged perforated fume tube or pipe 21 in axialalinement with the feed-screw and passing therethrough, the latter beinghollow for the purpose. This pipe 21 may be secured to the conveyer 10in any suitable manner, whereby the two pipes are arranged to rotate inunison. As shown in the drawings, (see Fig. 9,) the pipe 21 is providedwith two oppositely-disposed pairs of arms 22, arranged to embrace andclamp the adjacent parts or sections of the spiralof the conveyer 10.Each pair of arms is secured to the spiral section or lug by a bolt 23.These fastening devices arelocatedatsuitableintervals. Theforwardextremity of the pipe 21 is connected with a stationary fume-conduit 24in such amanner as to allow the perforated pipe to turn in theperformance of its function. A suitable con- The broken nection for thispurpose is shown at O in Fig. 7. The pipe 24cleads to a suction-fan,through the instrumentality of which the fumes rising from the orewithin the conveyer 10 pass into the perforated pipe 21, are carriedthence to the fu me-conduit 24, and forced through an outlet-pipe 26into a tank 27, containing water, wherein the fumes are condensed andsulfurous acid formed from the sulfur. This acid rises to the top and isdrawn ofi from the upper part ofthe tank when it has attained thedesired strength through a pipe 28 into an acid-tank 29. The pipe 28contains a valve or cock 30, which is normally closed.

From the foregoing description the operation of my improved apparatuswill be readily understood. The ore to be treated passes from the hopper13 to the feed-screw 1 f below, whence the screw forces the ore into therotary conveyer 10, which is surrounded by heat in the chamber 6 fromthe fire-box. The ore while traveling through the conveyer is subjectedto the action of the heat, whereby the sulfur and other fumes whichrender the ore in its normal state refractory and interfere with theseparation of the values from the gangue are Volatilized and made topass off in fumes which enter the perforated pipe 21 and are drawn bysuction through said pipe and the conduit 24 and are forced into thewatertank 27 through the instrumentality of the suction-fan, asaforesaid. In this tank the sulfur fumes uniting with the water formsulfurous acid,which when of the proper strength is drawn off, asaforesaid. The rear extremity of the conveyer 10 is closed, and theroasted ore passes through slots D, formed therein. The rear extremityof the chamber 6 is also closed, as shown at E, only sufficient spacebeing left for the exit of the roasted ore as it passes through theconveyer 10.

Having thus described my invention, what I claim is 1. In aroasting-furnace, the combination with a source of heat and a chamber incommunication therewith, of a rotary conveyer located in the chamber, ahollow feed-screw connected with the conveyer at one extremity, aperforated pipe concentrically arranged in said conveyer and passingthrough the feedscrew, and means connected with said pipe outside of thefurnace, for drawing off the fumes rising from the ore during theroasting operation, substantially as described.

2. The combination with a source of heat and a chamber in communicationtherewith, of a rotary conveyer located in the chamber and having closedwalls to protect the ore from coming in direct contact with the productsof combustion, a hollow feed-screw connected with the conveyer at oneextremity, a perforated pipe concentrically arranged in said conveyerand passing through the feed-screw, and means connected with said pipeoutside of the furnace for drawing off the fumes risin g from the oreduring the roasting operation. I

3. In a roasting-furnace, the combination with a combustion-chamber, ofa rotary conveyer extending longitudinally thereof and provided on itsinner surface with a broken spiral or a screw-thread for agitating theore and causing it to travel through the conveyer whose walls are closedto prevent the ore from coming in direct contact with the products ofcombustion, a hollow feed-screw connected with the conveyer at oneextremity, a perforated pipe concentrically arranged in said conveyerand passing through the feed-screw, and means connected with said pipeoutside of the furnace for drawing off the fumes rising from the oreduring the roasting operation.

4. In a roasting-furnace, the combination with a combustion-chamber, ofa rotary conveyer extendinglongitudinally therethrough, a hollowfeed-screw connected with the conveyer at one extremity, and aperforated pipe concentrically arranged in the conveyer and passingthrough the feed-screw for discharging the fumes from the conveyer,substantially as described.

5. The combination with a combustionchamber, of a rotary conveyerlocated therein, a hollow feed-screw connected with the conveyer at oneextremity, a perforated pipe concentrically arranged in the conveyer andpassing through the feed-screw, the said pipe being connected to rotatewith the conveyer, a stationary conduit connected with the said pipe,suction means connected with the conduit for drawing off the fumesrising from the ore during the roasting operation, a liquidcontainingtank, and a conduit connected with said suction means for forcing thefumes into the liquid of the tank, substantially as described and forthe purpose set forth.

6. The combination with a combustionchamber, of a rotary conveyermounted in operative relation therein,and havingits walls closed toprotect the ore from direct contact with the products of combustion, apipe concentrically arranged in said conveyer and having openings in itswalls to allow the fumes rising from the ore to enter, means forconnecting the pipe and the conveyer to cause them to rotate in unison,a hollow screw for feeding the ore to the conveyer, the perforated pipepassing through said screw, a stationary conduit connected with theperforated pipe outside of the conveyer, the connection being such as toallow one pipe to turn upon the other, a liquid-containing receptacle,and means connected with said conduit for drawing off the fumes risingfrom the ore during the roasting operation, and forcing them into theliquid of the receptacle for the purpose set forth. 4

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM H. MOTTER.

WVitnesses:

DENA NELSON, A. J. OBRIEN.

IIO

